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Well, 'urine' is just silly for a single-celled organism though. To me, the interesting perspective is that we're producing sugars for the explicit purpose of feeding S. Cerevisiae. It produces a waste product that acts in humans as a potent mood-altering drug. One which, to boot, increases sexual promiscuity, possibly giving an evolutionary advantage to those who'd feed yeast. It's commonly speculated that the production of yeast food may have been a driving force in creating agriculture and transitioning humans away from the hunter-gatherer lifestyle we evolved as. And from agriculture, you have "civilization" itself.